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Rheem XG40T09HE40U0 Review

By: Carl Laron on September 11, 2017

Bottom Line

The 40-gallon Rheem XG40T09HE40U0 gas water heater offers terrific performance and ample capacity for families of up to four people. It's backed by a nine-year warranty and offers good features for a storage water heater at this price point. It meets all current energy efficiency regulations.


  • Reliable
  • Low price
  • Meets energy regulations


  • Not the absolute best energy efficiency
Our Analysis

Breaking it down


Hot water for four. The Rheem XG40T09HE40U0 is rated to provide up enough hot water to meet the needs of moderately sized families of up to four people. The controls are easy to use, and while this isn't the most technologically advanced hot water heater you can buy, it's economically priced and has proved to be reliable. The low nitrogen-oxide (LNOx) burner doesn't meet the strictest standards in place in some parts of California, but still reduces emissions. For those who live at higher elevations, the Rheem XG40T09HE40U0 gas water heater is certified for installation up to 10,100 feet. The electronic ignition does away with the need for a pilot light, improving safety and cutting gas use. User reviews are highly positive, and owners largely agree that the Rheem XG40T09HE40U0 delivers every bit of the hot water it promises. For larger households (of up to five people), the 50-gallon Rheem XG50T09HE40U0 Performance Plus 50 Gal. Tall Water Heater (Est. $590) is similar, and similarly well liked.


Sufficient efficiency. This 40-gallon gas hot water heater isn't the most energy efficient model available, but that doesn't mean that it's not very efficient compared to earlier models. It has a .62 Energy Factor, which means it meets the current NACEA regulations, which set a high bar for water heater efficiency overall.

Reliability and warranty

Excellent track record. This Rheem hot water heater is covered by an excellent warranty for a model in this price class -- nine years overall plus two years of in-home labor. While you'll find some lemons with any product, the XG40T09HE40U0 enjoys a very strong track record, and we didn't spot any pattern of complaints that might indicate a potential sore spot.

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